Galvanic cell.



J. T. SZBK. GKLVANIO CELL. APPLIUATION FILED SEPT. 23, 1907.

Patented Dec. 8, 1908.

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UNITED sTA Es PATENT OFFI E. I

JOSEPH THEODOR szEK, orLoNDo1 I, EiIGLAi ID. i

Patented I). a, 1908.

Application am leptember as, 1991. Serial No. 894,240.

To all 'uihom it concern:

Be itknown. t at I, Josnrn THEODORY SzEK, electrical engineer, residing at 53/4 Chancery Lane, London, W. 0., En land,

. same. '1

This invention relates-to an-improved construction of a galvanic cell in which the destructible ne ative-pole electrode consists of any suitab e' metal, such as zinc, magnesium or alloys of such and is so constructed as to increase the surface of action. Wheil making the. negative electrode or element in such cells, dry or wet, of erforated, sheetsuncombined or combined with a solid sheet,

it is possibleunder special circumstaneesto create a somewhat increased active surface, with given weight and thickness ofsheets: without however affording the desired conditions for the uniform attack and circulation of the'electrolyte around such element. A-

far more satisfactory exposure and utilization ofthe' negative element is'however pos- .sible-when, in carryin .out this invention, so

called expanded meta instead of metal is-em loyed.

As iswe known, ex anded metal is ro-v du ed by slotting a soli sheet which is t en exiganded or stretched transversely {whereupon the slots are'enla in the form of gaping -(honey comb like openings and the strips between the slots assume apeculiar twisted shape. The term expanded metal as herein employed is limited to metal strucperforated tui'es of the type above described and this materialis both :eeonomical in manufacture because the waste which results from the.

manufacture'ofperforated sheets is obviated, and it is especially suitable for affordmg a comparativel large exposed surface in- .contact with the e ectrol'yte.

y To further illustrate my improvements reference is made to the accompanyixfi drawn eleva tion of my invention;

For the lpu se of fo an electrode or eet of expanded metal 1, may

be combined with one or several layers of solid metal or with layers of perforated .metal 2.

In the. application of the invention especially for dry cells, it has proved advantageous to cover the electrode consisting of one or severalsheets of expanded metal and otherwise in the form of an ordinary zinc cylinder (or plate) inside and outsidewith a loose wove of hemp, jute, canvas or the like '3, which is saturated or well coveredwith the electrolyte and in some instances impregnated to make it resisting to acids. Suitable electrolytes or implrlegnating' substances may be adopted for t 's purpose and it has been found practicable to prepare the electrolyte, suchas sal-a'mnzomac, in the form of a 'elly like mass v4:, with rice for example and to apply it to the said wove or fabric before belng employed as afcover on and around the negative electrode; The fabric keeps the electrolyte mass porous and'permanently uniformly distributed over theentire surface of the metal whereby a uniform c emical action is attained in the cell. The expanded metal as compared with perforated sheets enables a much more economical utilization, because a smaller weight proportion aflords a'larger surface of current and kept read in the ne' hborhood of the electrode for t redeposited thereon. The cell shown" in thedrawing as a comlete galvanic element has the usual depoepurposeo being. I T

arizing bag 5, containing the positive car-' bon electrode 9, with suitable terminals 10 and 11, on' ositive and n tive poles spectively. he whole I inc ose in a paper 'mach' case or cover 12, and insulate the bottom of the cell by stan same on a paraflin dipped piaqu e ecellis capped with the usual material such as pitch thereto and in electrical communication 14, or sawdust capped with pitch; and vents therewith, said casing and expanded metal 15 in said capping allow the gases to escape. comprising one electrode of said battery,

v l claim:- substantially as described.

5 1. A battery of the character described Intestimony whereofI afiix my signature, 15

comprising an expanded sheet metal elecin presence of two witnesses.

trode. w y JOSEPH THEODORSZEK.

2. A battery of the character described, Witnesses: I comprising an outer metal casing and a layer N. R. JAURALDE,

10 of expanded sheet metal disposed adjacent F. SMITH. 

